Modified from Crowded Earth
8 cups of zucchini apples (that's 2 quarts)
1/2 cup cold water
1 tbsp cornstrach
1 cup oats
1 cup brown sugar
1 tsp apple pie spice
3 tbsp butter
Place apples in a medium bot. In a small bowl, whisk the water and cornstarch until smooth. Pour into apples. Bring to a boil and boil for about a 1 minute or until the liquid thickens up.
Transfer to a greased 2 quart baking dish (8 by 8) - this was REALLY tight and so it over boiling over during cooking (I had a sheet pan under it as I expected it so I might use a 13 by 9 next time, which is 3 quart.
In a medium bowl, mix oats, brown sugar, spices and butter. Use a pastry cutter to combine until they look like crumbs. Spread over the apple mixture.
Bake at 350 for 1 hour.